This question is only for genius
explain static and kinetic friction in detail.
Answers
What Is Static Friction?
Have you ever noticed that it's harder to get a shopping cart moving than it is to keep it moving. If you try to push your couch across the room, the first push is the hardest part. Maybe people assume that's nothing more than psychological, but there really is a physics reason for it. The reason is static friction. Friction, in general, is a force that makes it harder for two objects to slide alongside one another. Static friction is the friction that exists between a stationary object and the surface on which it's resting.
Once the objects have already started moving, kinetic friction takes over. This is the friction that exists between two objects moving relative to each other. Kinetic friction isn't as strong as static friction, and so it's easier to keep the shopping cart moving.
What Causes Friction?
If you were to see an extreme close up of an otherwise smooth surface, you'd see that it contains a whole landscape of mountains and valleys, pits and bumps. These imperfections cause two surfaces to grip each other and make it hard for things to slide.
But when an object is stationary, there's also something called adhesion between two surfaces. Adhesion is where two non-moving surfaces stick together slightly, due to some light chemical bonding between the materials. This is what makes static friction so strong.
Inequality for Static Friction
Force is a push or pull, measured in Newtons (N). Friction is one such force. We can calculate how many Newtons of frictional force there are between two surfaces using this inequality:
Answer:
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